Government Facility or Secret Lair? Tokyo's Tower of Wind

In this latest installment of bringing you all the secret lairs of global super-villains, we present you with the Kawasaki Man-Made Island of Japan (aka the Kaze-no-to or "Tower of Wind"). The island is actually a ventilation facility and is the midway point between a massive undersea tunnel called The Tokyo Bay Aqua-Line that connects Kisarazu City and Kawasaki City. The entire project was 30 years in the making, and most humans only get to see the island from the window of an airplane or via Google satellite view, but we're sure there's at least one super-villain hiding in there somewhere.

Via Digital World Tokyo